Battery cover plate assembly comprising a current interrupt apparatus

Abstract

A battery cover plate assembly, a cell, a battery module, a power battery, and an electric vehicle are provided. The battery cover plate assembly includes a cover plate, an inner lead-out member, and an outer electrode terminal. The inner lead-out member and the outer electrode terminal are electrically connected by using a current interrupt apparatus. A flipping member of the current interrupt apparatus is electrically connected to the outer electrode terminal. A score member is electrically connected to the inner lead-out member. A score is formed on the score member and is electrically connected to the flipping member. The inner lead-out member is mounted on the cover plate through a cover plate insulator. The cover plate insulator has a first engagement portion engaged with the cover plate and a second engagement portion engaged with the inner lead-out member.

What is claimed is: 
     
       1. A battery cover plate assembly, comprising:
 a cover plate, 
 an inner lead-out member located at an inner side of the cover plate, 
 an outer electrode terminal located at an outer side of the cover plate, and 
 a current interrupt apparatus, 
 wherein the inner lead-out member and the outer electrode terminal are electrically connected through the current interrupt apparatus, the current interrupt apparatus comprises the score member and a flipping member, the flipping member is electrically connected to the outer electrode terminal, the score member is electrically connected to the inner lead-out member, a score is formed on the score member and is electrically connected to the flipping member, and the flipping member acts under an effect of air pressure to break the score, and the inner lead-out member is mounted on the cover plate through a cover plate insulator, the cover plate insulator comprises a first engagement portion engaged with the cover plate and a second engagement portion engaged with the inner lead-out member, and 
 wherein the second engagement portion forms an annular slot and the inner lead-out member forms a sheet structure, the annular slot formed by the second engagement portion is configured to accommodate an outer periphery of the inner lead-out member. 
 
     
     
       2. The battery cover plate assembly according to  claim 1 , wherein the cover plate insulator comprises a substrate attached to a lower surface of the cover plate, and a mounting hole configured to mount the current interrupt apparatus is formed on the cover plate, the first engagement portion comprises a first annular protrusion connected to an upper surface of the substrate and having an L-shaped cross-section, the first engagement portion forms, with the substrate, a second annular slot configured to accommodate a hole wall of the mounting hole through folding outward after passing through the mounting hole. 
     
     
       3. The battery cover plate assembly according to  claim 2 , wherein the inner lead-out member forms the sheet structure, and the second engagement portion comprises a second annular protrusion connected to a lower surface of the substrate and having an L-shaped cross-section, the second engagement portion forms, with the substrate, the annular slot configured to accommodate the outer periphery of the inner lead-out member. 
     
     
       4. The battery cover plate assembly according to  claim 1 , wherein the sheet structure formed by the inner lead-out member comprises an intermediate welding region electrically connected to the score member and an edge welding region electrically connected to a pole core, the edge welding region is located at an outer side of the intermediate welding region to be engaged in the annular slot formed by the second engagement portion. 
     
     
       5. The battery cover plate assembly according to  claim 4 , wherein a thickness of the edge welding region is greater than or equal to a thickness of the intermediate welding region. 
     
     
       6. The battery cover plate assembly according to  claim 4 , wherein the edge welding region forms an annular connection region surrounding the intermediate welding region or a strip-shaped welding region located on two sides of the intermediate welding region. 
     
     
       7. The battery cover plate assembly according to  claim 1 , wherein the score member comprises a score region on which the score is formed, a first welding region electrically connected to the flipping member, and a second welding region electrically connected to the inner lead-out member, the score region forms an elongated structure extending along a length direction of the cover plate, the score extends along a length direction of the elongated structure, and the first welding region and the second welding region are disposed on two sides of the score region along a height direction of the score region and respectively form an elongated structure extending along the length direction of the cover plate, and the intermediate welding region correspondingly forms an elongated structure. 
     
     
       8. The battery cover plate assembly according to  claim 7 , wherein an accommodating welding groove configured to accommodate the second welding region is formed on the intermediate welding region. 
     
     
       9. A cell, comprising a housing, a core accommodated in the housing, and a battery cover plate assembly packaging the housing, wherein the battery cover plate assembly is the battery cover plate assembly according to  claim 1 , the inner lead-out member is electrically connected to the core, and the flipping member is in gas communication with inside of the housing. 
     
     
       10. A battery module, wherein the cell according to  claim 9  is disposed inside the battery module. 
     
     
       11. A power battery, comprising a pack body and a battery module disposed inside the pack body, wherein the battery module is the battery module according to  claim 10 . 
     
     
       12. An electric vehicle, wherein the power battery according to  claim 11  is disposed in the electric vehicle.